Clinical features of patients with Myasthenia gravis from the Henan province, China.

<bold>Introduction: </bold>Myasthenia gravis (MG) occurs globally, and many studies have indicated that there are regional differences in epidemiology, biomarkers, and prognosis of MG.<bold>Methods: </bold>A total of 478 patients with MG who visited hospitals in the Henan Province between January 2010 and February 2014 were included. Age, gender, age at onset, serum antibody, thymus pathology, treatment information, and Myasthenia Gravis Foundation of America (MGFA) classification were assessed.<bold>Results: </bold>Compared with previous reports from other areas, we found some differences in MG patients from Henan. The proportion of childhood MG in our study was lower than other reports of Oriental patients with MG. There seems to be an association between onset age, muscle involvement, and acetylcholine receptor antibody levels. Thymectomy improved the symptoms in 78.5% of thymectomy-treated patients.<bold>Conclusions: </bold>These differences are likely related to geographical, environmental, and ethnic differences. Understanding these differences will help us to define more specific treatment. [ABSTRACT FROM AUTHOR]